package com.wsleo.common.utils;

import java.security.*;

public final class MD5{
	/**
	 * 32bit encryption of MD5
	 * @param s
	 * @return
	 */
	public final static String code(String s) {
		char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9','a', 'b', 'c', 'd', 'e', 'f' };
		try {
			byte[] strTemp = s.getBytes();
			MessageDigest mdTemp = MessageDigest.getInstance("MD5");
			mdTemp.update(strTemp);
			byte[] md = mdTemp.digest();
			int j = md.length;
			char str[] = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
				str[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(str);
		} catch (Exception e) {
			return null;
		}
	}
	
	/**
	 * number times 32bit encryption of MD5
	 * @param s
	 * @param num
	 * @return
	 */
	public final static String encryption(String s, int num) {
		for (int i = 0; i < num; i ++) {
			s = MD5.code(s);
		}
		return s;
	}
	
	//1.0f759dd1ea6c4c76cedc299039ca4f23
	//2.e4150451f6382c9cff6c063d36dcf21d
	public static void main(String[] args) {
		System.out.print(MD5.encryption("leo", 2));
	}
	
}
